Re:Some Differences Between macOS and Common Unix Systems
by jeffbee on Friday December 25, 2020 @10:49AM
(#25537085)
I don't know where you dug that up. That doc must be at least 10 years old. The clang that you get on an actual mac these days fully supports everything through C++17.
Edit: newer link: https://clang.llvm.org/cxx_status.html
(older link, not applicable, was here)
Cross compiling for some embedded architectures.
Things like FORTRAN or Ada, calling routines built there from C (or vice versa), etc.